Hi all, I have a 94 E320 with 193k miles. For the past few months i have noticed the car is consuming a lot of gas(about 13-15 mpg hwy). I used to get about 19-21 city and 25-29 hwy. I dont drive it hard either. I have always used 93 grade gas either Mobil or shell here in ohio. I changed air filter, oil and filter,fuel filter, spark plugs/wires at 190k. Engine harness upper/lower changed. Recently changed the whole exhaust, headers back since it was badly rusted and was getting loud. Any ideas, suggestions. Thanks in advance!